Input: fix input_free_device() implementation

input_free_device can't just call kfree because if input_register_device
fails after successfully registering corresponding class device there
is a chance that someone could get a reference to it. We need to use
input_put_device() to make sure that we don't delete input device until
last reference to it was dropped.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

include/linux/input.h

@@ -995,11 +995,6 @@ static inline void init_input_dev(struct input_dev *dev)
 
 struct input_dev *input_allocate_device(void);
 
-static inline void input_free_device(struct input_dev *dev)
-{
-	kfree(dev);
-}
-
 static inline struct input_dev *input_get_device(struct input_dev *dev)
 {
 	return to_input_dev(class_device_get(&dev->cdev));
@@ -1010,6 +1005,11 @@ static inline void input_put_device(struct input_dev *dev)
 	class_device_put(&dev->cdev);
 }
 
+static inline void input_free_device(struct input_dev *dev)
+{
+	input_put_device(dev);
+}
+
 int input_register_device(struct input_dev *);
 void input_unregister_device(struct input_dev *);